package com.spzx.common.rabbit.config;

import com.spzx.common.rabbit.entity.GuiguCorrelationData;
import lombok.extern.slf4j.Slf4j;
import org.springframework.amqp.rabbit.connection.CorrelationData;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.context.event.ApplicationReadyEvent;
import org.springframework.context.ApplicationListener;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Component;

import java.util.concurrent.TimeUnit;

/**
 * 服务器启动时，执行rabbitTemplate初始化，设置确认函数和回退函数
 * ApplicationEvent      一些子事件的父类。
 * ApplicationReadyEvent 具体子事件。表示应用程序启动好，IOC容器初始化好，存在相关bean对象了。再进行相关的初始化。
 * 也可以使用相关的注解替代： @EventListener
 */
@Slf4j
@Component
public class RabbitInitConfigApplicationListener implements ApplicationListener<ApplicationReadyEvent> {

    @Autowired
    RabbitTemplate rabbitTemplate;

    @Autowired
    RedisTemplate redisTemplate;


    @Override
    public void onApplicationEvent(ApplicationReadyEvent event) {
        this.setUpInitRabbitTemplete();
    }


    private void setUpInitRabbitTemplete() {

        /**
         * 只确认消息是否正确到达 Exchange 中,成功与否都会回调
         *
         * @param correlation 相关数据  非消息本身业务数据
         * @param ack             应答结果
         * @param reason           如果发送消息到交换器失败，错误原因
         */
        this.rabbitTemplate.setConfirmCallback((correlationData, ack, reason) -> {
            log.info("关联数据是：{}",correlationData);
            if (ack) {
                //消息到交换器成功
                log.info("消息发送到Exchange成功");
            } else {
                //消息到交换器失败
                log.error("消息发送到Exchange失败：{}", reason);

                try {
                    Thread.sleep(100);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                this.retrySendMessage(correlationData);
            }
        });

        /**
         * 消息没有正确到达队列时触发回调，如果正确到达队列不执行
         */
        this.rabbitTemplate.setReturnsCallback(returned -> {
            log.error("队列没有接收到消息：{}",returned);

            String uuid = returned.getMessage().getMessageProperties().getHeader("spring_returned_message_correlation");
            GuiguCorrelationData correlationData = (GuiguCorrelationData) redisTemplate.opsForValue().get(uuid);
            if(correlationData!=null && !correlationData.isDelay()){
                try {
                    Thread.sleep(100);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                retrySendMessage(correlationData);
            }
        });

    }

    /**
     * 消息重发
     * @param correlationData
     */
    private void retrySendMessage(CorrelationData correlationData) {
        GuiguCorrelationData guiguCorrelationData = (GuiguCorrelationData) correlationData;

        Object message = guiguCorrelationData.getMessage();
        String exchange = guiguCorrelationData.getExchange();
        String routingKey = guiguCorrelationData.getRoutingKey();
        int retryCount = guiguCorrelationData.getRetryCount();
        if (retryCount>3){
            log.error("三次重试失败");
            return;
        }

        retryCount++;
        guiguCorrelationData.setRetryCount(retryCount);

        redisTemplate.opsForValue().set(guiguCorrelationData.getId(),guiguCorrelationData,10, TimeUnit.MINUTES);
        rabbitTemplate.convertAndSend(exchange,routingKey,message,guiguCorrelationData);
    }


}
